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authorEric Dumazet <edumazet@google.com>2022-04-15 17:10:44 -0700
committerDavid S. Miller <davem@davemloft.net>2022-04-17 13:31:31 +0100
commit4b506af9c5b8de0da34097d50d9448dfb33d70c3 (patch)
tree85bf443d86dfce9485a99b41cb1ea5b96173d228 /net/ipv4/tcp_input.c
parent669da7a71890b2b2a31a7e9571c0fdf1123e26ef (diff)
tcp: add two drop reasons for tcp_ack()
Add TCP_TOO_OLD_ACK and TCP_ACK_UNSENT_DATA drop reasons so that tcp_rcv_established() can report them. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 85fae79c894d..8a68785b0405 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3766,7 +3766,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
if (before(ack, prior_snd_una - tp->max_window)) {
if (!(flag & FLAG_NO_CHALLENGE_ACK))
tcp_send_challenge_ack(sk);
- return -1;
+ return -SKB_DROP_REASON_TCP_TOO_OLD_ACK;
}
goto old_ack;
}
@@ -3775,7 +3775,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
* this segment (RFC793 Section 3.9).
*/
if (after(ack, tp->snd_nxt))
- return -1;
+ return -SKB_DROP_REASON_TCP_ACK_UNSENT_DATA;
if (after(ack, prior_snd_una)) {
flag |= FLAG_SND_UNA_ADVANCED;
@@ -5962,7 +5962,8 @@ slow_path:
return;
step5:
- if (tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT) < 0)
+ reason = tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT);
+ if (reason < 0)
goto discard;
tcp_rcv_rtt_measure_ts(sk, skb);